low to mid 400s through an auto is easy 10's with the right setup. on 10psi he goes 10.7s @ 125-127^Thats a 5.0 right? Yes, they have shorter stroke and also stronger rods, and can handle alot more power than my current engine....but he better watch out, because he WILL bust out the mains if he doesnt watch it. He needs an R302 block, or a Dart block...or something of that nature. At the VERY LEAST a crank/main girdle.
The 5.0/302 blocks are very weak...they start failing in the 600-700RWHP range.
One guy on line has went through 3 blocks in a matter of no time....has like 580RWHP. Cracks them and just rebuilds lol. So watchout how much power you try and send through it
you gotta keep the revs down and these blocks will hold together, its when people get greedy and keep revving them is when they start to go quickly. of course tuning properly is a must(low timing and good fuel)