Why not put a bigger cam in it, back the timing out a little and rev it to maybe 63-400. That way you're within your comfort zone but will still probably run mid 10's. I shift my .590 at around 6300 with nearly 13.1 comp, trap at 6700 and it's pulling like a train.
Mick

It will he fine, stock blocks have no issues till.you get over a magical 512 number in full race mode,
I run stock rods shift 6500 cross the line at 6800.
A 494 (500)) ci will have no issues , in fact should be a great build
Far as camshaft goes you have to ask is it race or street ,or combo.
Really not much difference, .
I'm not a large centerline guy never want to see a 110 or above stuff
That kills low end , a 494 will be have a ton of tq so why build something that requires rpm ?

Cab I been running e-85 for years now. so same carb. This a Bracket race only. going to put a UD640 lift cam in it. at 102 and baby it LOL

The CR is not to high,and its perfect to run E85 and even better to run alcohol.I think you would like the alcohol better than the E85 and it would make a lot more torque,more torque=more power/speed with out having to raise the RPM level.