Any 340/360 head will (should) have larger valves @ 1.88/1.60 vs. 1.78/1.50 (with exception of 68-71 340 hp or T/A heads). The 340/360 will also have larger ports. Look for 302 or 308 as the last numbers in the casting, these heads have the most potential and offer better performance than older castings.
360 heads
I was in the junkyard the other day and I saw a 360 in a mid 80's van and I was wondering if the heads would be better than my stock ones.
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