[Wayne in NZ]

Hi Dave.

You have almost exactly the same issues as me.
I have a carbed 68 camaro with a small roots blower, very similar set up to your car.
I have no doubt that your car would make pretty good power, as does mine. However the problem with the small roots blowers is that they are overdiven in relation to the crank.
With my car the blower is 2.4:1 overdriven to make about 7psi. This is mainly because I have very efficient heads and the engine flows very well.
I limit my engine Rpm to 5500RPM because of the high blower RPM. This is not a problem though as it has tonnes of tourque down low.
Still though at 5500RPM my blower is doing 13200RPM.
Even when driving about town, at 2500 RPM (about 60Mph) it is doing 6250Rpm.
Because of the high Rpm's the blowers can get pretty hot, hot intake air is no good. Hot AIT's mean you have to reduce timing to prevent detonation. Reduced timing means reduced power.
I have done everything I can to reduce the AIT. Sealed the intake to the cowl bonnet so it can only draw air from outside the engine bay and made phenolic spacers to go between the manifold and blower and the blower and carb.
The next thing is supplimentary injection.
I have thouroughly researched all the other ones as best I could by either asking the manufacurers about thier system of operation or checking out running systems here, ( some were a bit secretive though ) and from what I can determine the cheaper "preogressive" systems merely speed up and slow down the pump by varying the pump voltage.
Considering that the pump would need about 9Volts in order to have enough energy to create enough pressure to properly atomise the injectant at the "on" point and that they most likely run them past 12 Volts ( say 14Volts ), I felt that that was not a very true progessive method.
Because I am a predantic bugger and want to get the most out of a system I wanted to be able to begin injection while still in vacuum, as this is where most of your driving is done unless under heavy accelleration. I struggled to find a system that could do that.
That said, they are good products for what they are designed to do, I wanted better.
After many emails to Jeff at Howerton Engnineering I decided to fit the HSF-6 system from Aquamist.
I was going to use the '3 as it can be configured to run of an external MAP sensor. There is the added cost of the sensor and some mods to the unit so I decided to get the '6 which is designed to have an onboard MAP sensor ( I chose -1Bar to +1Bar). It also has other functions as well.
I have a B&M blower which is what it looks like you have and I have tapped the jet recepticles directly into the top of the blower case. One in front and one behind the carb adaptor. They sit pretty much under the carb bowls. I did this because I dont have clearance under the bonnet to fit a cheater plate under the carb.
So, yes it can be done.
There are some minor issues with injecting in vacuum however, as I am learning, but nothing that cant be overcome with a bit of cleverdickery.

In my opinion, the aquamist systems are the best true pregressive rate sytems available using PWM control. This effectively replicates a normal fuel injector's operation.
They have come from WRC beginnings where efficiency and reliability are first and foremost, not from supply and demand by petrolheads.

I hope this helps answer your question. Sorry about the rant.

Cheers

Wayne