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yea i'll be running '66 289 heads on my 302 block ported intake/exhaust, bigger valves put in, massage the bowls a bit and that'd put me right at about 10:1 compression.
look closely, those headers have a 3bold flange :yuck: means you will need a 3 bolt midpipe and the funny part is that summit does not even sell a summit midpipe for longtubes, let along with a 3 bolt midpipe. talk about FAIL
get BBK or something similar
off of late 60's 351's or early 70's ones or 302 's
I picked up a set with bigger valves already installed and lightly ported for 300 beans all done up