My take:
I have used the 74/75 block and made over 900hp on spray without issues.
The 400 block with the 455 crank I ran at VMP running 9.30 flat on pump gas is a 74 block .090 over) so don't think that any certain year is that much better. As long as it's a pre 75 block, check the webbing, check for cracks and bore thickness, etc, most will hold up to what most people are doing.
If your gonna start putting billet caps and all the other stuff, making over 750hp and don't own a machine shop, LOL. Then I would start looking at the aftermarket block as far as dependability and longevtivity.
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