The Isky is much better than anything Comp is offering and it should work with stock springs, although I recommend you check the installed height. Compare the lift of the Comp 268 to the Isky and that should tell you if it will work with stock springs. I would recommend a spring change, but stock valvetrain will work fine.
Edelbrock performer (not RPM) is a good manifold. Shift at 5500-5800 for best 1/4 mile tiimes...anything over that exceeds the airflow capability of the FE heads. Spend the money and buy a mallory Dual Point distributor and dial it in (you can do it on the bench with the tool they send) to yield 20° BTDC at idle and 24° total.
Once installed, he will need to take a vacuum reading at idle and select a power valve that is 1/2 that value. For example, if you have 8 in/Hg at idle, you want a 4.0 in/Hg power valve.
Set the Holley up with .075 primary jets, .028" anti-pullover discharge nozzle on a black pump cam in position #2. Set the pump lever for .020" clearance with a feeler gague at WOT.
His Holley probably has a secondary metering plate instead of jets, so study the Holley book and buy the correct drill bits to enlarge the rear fuel metering orfices to a full 6 steps bigger than the front. If you have the rear metering block, just change the jets. Buy the secondary spring pack and use the 'purple' spring.
Use NGK WR-5 spark plugs gapped at .038" when you can find them and *always* use a Copper Core Coil Wire.
Just email me at
10851man@gmail.com if you need anything else....You will be impressed.