Too many variables to give a part # or anything like that...
Manley, Ferrea, Comp are places to look.
Look for undercut stems or not, overall length, diameter (duh), tulip shape or not, # of keeper grooves, material, weight, back-cut or not, stem diameter, price, .... as appropriate to your specific situation.
I'm totally green, looking to spend around $20 max per valve as a baseline. Pump gas 502 base 10:2-10:5cr. Once I get about 3 to choose from will determine 11/32 stem/backcut/length..ect.. trying to get a lead on decent stainless steel durable brands in that range.
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