383, thanks. I have a Performer manifold, new timing chain, Z28 springs (which don't mean much with a little cam), 1.5 roller rockers for breakin and then use 1.6 roller tipped rockers and hoping to get an honest 250 HP at about 3500 rpm with only an Edelbrock 600 cfm carb and shorty tube headers. Gee whiz what did they do to that '76 350?

Don Shillady
Retired Scientist/teen rodder