Ok... don't go to 351 heads; bigger combustion chambers and therefore, less power than if you just pocket ported and put larger valves on your original heads... trust me, these work well. Since you went with the performer stuff, i would recommend this for the best mid range performance. I'm sorta an expert in 289 edelbrock performer stuff... my engine pulls farther than 5500rpm as described in the performer kit, but i'm using a holley and shelby intake. Look into it, bigger isn't always better
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'63 Merc Meteor hardtop, warm 302, C4 auto, 2.25" Flowmaster Exhaust,
'65 289 heads - ported/chevy valves, performer cam, edelbrock f4a intake, full length hookers, 600 holley, roller rockers, k'n, 10.5:1 hyperutetic pistons... mid 13's hoping to reach into 12's
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