Hot Rod did at test of HF stands and found that they would hold beyond the listed capcity. They ended up pushing down on the 750# (I think, it was a while back) stand with a fork lift to get it to bend.
Like others have said, I think the weak point is having the adjustable arms to accommodate different bolt paterns. A plate or fabbed head would probably be the way to go regardless of the stand.
1968 Plymouth Fury III 2dr FT, 383-4v, 4 speed
1972 AMC Ambassador SST wagon 360-4v, automatic
2014 Challenger R/T Classic 6-speed
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