Hughes Girdle ! Opinions Appreciated

IMO the girdles don't work. There are a couple I've used for BB MoPars that helped, but they were expensive and required some machining to make fit.

I had rules of thumb to work with.

If it's over 550 HP it needs an aftermarket block.

If it spins over 7800 RPM's it needs an aftermarket block.

I've done that much power on Pcar blocks but it just wasn't worth it.

Also, I see you want to use a tunnel ram and a big carb with two 450 Holleys. That's a recipie for a pig. Skip the 450's as IMHO they are junk. Spend your money on a pair of double pumper carbs in the 1.375-1.400 Venturi range that have been set up by a competent carb guy. Well worth the money AND it will save you time and money in the long run.

Also, you'll need a cam that is ground for the tunnel ram. Call a cam grinder and get a cam ground for what you are doing. You'll be much happier in the long run, with less frustration.

Just my .02 that you didn't pay anything for.