I'll try to address your points, I've had Ford V8s in other conversions I've done 1972 240Z and Mustangs. It's too much work and cost trying to find and try Ford components that make as much power as Chevys do. Not so much today with all the 5.0 based after-market.
The fastest 5.0 V8 Miatas I've seen are 377 strokers, with ridiculous builds, to normally aspirated make about 415 RWHP. My friend's Ford 5.0s modded to that kind of ragged edge performance on Sunoco or VP, cost more than my new crate LS2 making 400 HP & 400 Ft/ Lb torque STOCK on unleaded pump gas!!
That's just a starting point, you mentioned 650 HP with a Whipple Blower, how about 700 HP normally aspirated (No blower or turbo)? We've got GTOs and Cadillac CTS-Vs all over Phoenix posting those kinda numbers.
Normally aspirated GM, versus ragged edge, race built Ford with blower for same power?
Make mine GM, Thank You
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- Lee