Thank you guys. I guess I'll keep it reverse flow.
I also found all the strange valve uses that Pontiac did, making 58 and 60 the same but not 59, plus all the SD stuff.
I find it odd that overall length of valves is used when a grind on the margin will change the spring height. That is why I was after that dimension so I could check where I was. My question for using 59 valves was that I located some in oversize, but not the 60. I'm trying to avoid replacing the guides so that I do not disrupt the existing alignment of the guides and seats.
I may be looking for "blueprint" level data when backyard close enough is fine for a stock driver.
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