The 68404 springs are good for more than .52” lift. Would be my first pick for springs in your combo for either cam. FWIW, I would only shim the intakes with the Lunati. And only if it has 30* intake valves. I know sometimes Butlers change the intakes over to 45*. Depending on how the springs are set up they can run upwards of .54”- 57” lift.
I would rather do the 704 Lunati if you can find one. It will have a stronger mid range than the SPC-8, well suited for a manual tranny set up with the gears are space closer together. I would not expect much difference in max power though between a SPC-8 and a 704 with stock heads, but would think the 704 would out perform the SPC-8. But it will come at a price, I think you will find it will be pickier on fuel than the spc-8.
I agree with Bart too. If the spc-8 is what is available, it will work fine. The summit 2821 is the same cam if you can’t find a melling spc-8.
Last edited by Jay S; 08-27-2021 at 12:37 AM.
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