Originally Posted by Richiesproject
I have recently came upon a 92 camaro with a 350 backed by what i believe is a 700r4 trans. I wish i knew more about whats in the motor but when i bought the car was told it was pulled from a 90's chevy pickup and that's all the info the guy could give me. It's definitely not the original motor as when i ran the numbers it should have TBI, instead I'm working with a carb setup and need to know what to look for. I've just installed a pro comp dual plane high rise intake. The car is to be a daily driver to and from work (about 10 miles one way). Gas mileage isn't a huge factor but passing the gas station once or twice is a real plus... So I've spent a few hours skimming different posts here and there and have came to the conclusion that i want to look for a 650 cfm dp with vacuum secondary, but I'm not sure if that's the right application for my setup. any input will be ready carefully and greatly appreciated, thanks
You DO want a carb in the 600-650 cfm area. There are DP (double pumper, or mechanical secondary) carbs, then there are vacuum secondary carbs. You will want a vacuum secondary carb, but not a DP carb. A common Holley carb of this type is the Holley 1850. It's a bare-bones, 600 cfm carb w/vacuum secondaries that's been used millions of times on engines like yours. A Q-jet carb would also be a good choice, if the intake will fit one w/o needing an adapter plate for it to fit.
A set of headers will also help performance and mileage. The problem is you want to use long tube headers if at all possible for the best effect, but this will mean swapping to a floor-mounted shifter in many cases. But there may be headers that will work w/the column shift- you'll need to r4search this.
The original HEI distributor used w/the TBI should have been changed to the earlier, stand-alone (needs no computer) HEI, or some other distributor/ignition set-up. If so, recurving the distributor advance and dialing the initial and total timing is always
worth performance and MPG. What is your distributor like- does it have a vacuum advance as well as a mechanical advance in it?