[cuda66273]

You curved the distributor?

So now you have about 22-24 Initial and 35 total at about 28-2900 RPM all mechanical advance no vacuum unit...right?

Not Happy with the 750 Demon???

Your 750 Mighty Demon should be tunable although a 650 Mighty Demon would work allot better on that little motor.

You do have the Mighty Demon right?

A 290 advertised duration is about a 244-46 at .050, that's a race cam or at least a stout bracket car. It will make it's power from about 3000 to 7000 RPM.

Your Performer manifold can't breath enough to handle the cam which really wants a single plane large plenum intake and a good set of heads with at least a 2.02 valve.

Of course when you add manifold volume the velocity decreases and the bottom end falls off even worse although the top end 3500 to 7000 the thing will be trying to turn itself inside out.

So what we have here is a typical imbalance of components and it's maybe time to make some decisions on how you want the car to perform.

If you want street manners and canyon carving smooth performance then you should look at a smaller cam to match the manifold, compression ratio and head flow that you already have...look at a Racer Brown SSH 24.

Nice Hydralic cam, ground pounding sound, good low end tork, works good with the Performer Manifold and will carry 6000 RPM without any problem and maintain reasonable street manners.

If you want that all out asphalt ripping neck snapping dragster type power then you need to make some changes to match that cam.....single plane manifold, better heads, more compression (at least 11.5:1 on Al heads and 10.5 on steel) you'll need to run additive or mixed race gas, maybe even some more gear and be prepared to let it rip to about 6500 to real let it work. You might be able to live with the 750 as long as it is a Mighty Demon.

So where do you want to go and maybe I can help you get there?

Don