No way is a Comp XE268 the right cam for an 8:1 383. The largest cam I'd say fit the bill would be Nughes SEH1016BL-12 http://www.hughesengines.com/Index/produ...mp;partid=30251
Or Lunati Voodoo cam 10230700
Or Comp XE256H 21-221-4

Another thing is compression: Don't put a lot into the 906s right now, the Edelbrock E-Street heads at 75cc will put the engine right at 9.0:1.
R.

Last edited by dogdays; 09/14/16 09:32 PM.