"...If you have more up to date information..."
No, I don't personally have any info.
But, I have noticed that from time to time I have found that some info for Pontiac engines is not complete. It's quite possible, & even very probable that many of the less popular combinations are just not updated as often, as the very popular Chevy, Ford, & Mopar combos are.
I'm sure you are familiar with Adam Strang & Norman Warling's combos, from the PY forum.
If you'll remember, Adam got a CP forged piston approved for the '68 Pontiac 350HO. For many months AFTER it was approved & had an NHRA legal part number, it was not listed on CRI. I see that it is, now. They're also now listed for all the other 350 engines up thru '73, whereas, up until recently the only 350 pistons listed were TRW L2339. I haven't checked on 'em recently, so I don't know EXACTLY when they were listed on CRI.
http://www.classracerinfo.com/Engine...8&MAKE=Pontiac
As you know, Norman tried a 421SD engine in his '62 Cat. He was trying to find an original piston to copy, in order to have a legal forged piston made & approved.
I don't know what pistons he used. But, he posted that he did indeed install & run the 421SD engine. So he used some pistons of some sort.
Just looked up the '62 421SD engine on CRI. There are no piston specs listed at all, & no legal piston number shown. Also, the body application page won't work. Just shows "Error" notices.
http://www.classracerinfo.com/Engine...6&MAKE=Pontiac
I don't have the correct info. Don't know for sure who does. Don't know if the info can be found on some NHRA site, or not.
Bottom line is that I stand by my statement that not all info is always completely up date. Not complaining or blaming anyone. Just making a casual observation. I don't have a dog in the hunt.