For the mustang.
331 stroker crate motor.
With all this talk of hemis, I'm reminded of the L-88 Chebbie, back in the day, I put together for a friends 67 El Camino. A guy could go to our local Chebbie dealer & buy an L-88 short block, a set of heads and use aftermarket stuff to finish it off
*for under a thousand bucks*. That thing was a beast....not at all helped by that light rear end. A glance at the throttle would put you sideways. That motor was waaay under rated at 430 hp. It cured me forever of super powered cars on the street. Another buddy's hemi RR was tame by comparison.
The little 331 will be fine for an elderly fella. ......