I have to admit...600hp and 7000RPM (even without the stroker crank) on ANY stock LA block (even a TA) would terrify me. With a 3.79" stroke, that's over 4400fpm...that is NASCAR piston speeds, on a production 360 block. I'd spend the money on an R block before a pair of W9 heads.
Well I kinda agree especially on an endurance application like mine. The hot ticket would be big bore/ short stroke but the only block that comes close is an overbored 340 unless you have a race block.
I am not a big fan of these 408+ engines especially with heads that can't supply enough air. I would want at least 330+ cfm on my race motor if I went that big.
My son used to maintain a friends large muscle car collection. I drove one of the 408/4speed Darts in the collection... Not impressed. Just my opinion.
