The table would have to have the same cloth that Willie used (whatever that was) or something with essentially similar properties. I know it wasn't Simonis 860 and was much slower with a nap.
The hardest part about straight pool isn't pocketing balls (which the table and pocket sizes affect), it's opening up the pack and subsequent clusters while continuing a run. Many times with Simonis 860, all it takes is one break shot. With a slow cloth, it usually takes two or three attempts to fully separate the balls. For this reason, straight pool is far too easy for pros on Simonis 860 no matter the table and pocket sizes.
IMHO, breaking Mosconi's record on a table with Simonis 860 would require an asterisk.
I think the talk of all that slow cloth is exaggerated.
I played lots from the middle 60's on and played on lots of fast cloth.
Played very little bar-box and that's where most of the rough cloth was.
In Florida, I actually played 9-ball on carom cloth...'68.
In '78, the best 5x10 snooker table I ever saw was in Decatur IL....
..it had carom cloth.
The famous Rack in Detroit, when Gil Elias owned it, had cloth that was
somewhere between carom and 760 speed-wise.
LA,in the 60's....never ran into one 'horse-blanket'.
Some pool halls DID have thick cloth, but in general I associated cheap
cloth with 'bar' conditions.