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I have a clean '71 360 block and just purchased a set of bare J heads....I plan stroking to a 408 and installing 2.02/1.60 valves with possibly a roller set up.... I'm starting to collect parts as the budget dictates and am looking for ideas on a unique single 4bbl intake....What do you guys...

I just picked up a bare set of J heads with casting numbers of 3671587. I've de-coded them and found that these heads could be from the following: 1973, 340 1973-74, 360 1976, 360 My questions are, how can I tell which ones I have, and does it make a difference? All 3 show 1.88-1.60...