I have a stock 91 Z28 305 TPI engine that I'm putting in my '57 Chevy pickup.
I am going to keep the internals of the engine bone stock and am going to use a set of repro Corvette 2 1/2" ramhorn exhaust manifolds with it. I intend on setting it up with a 2 1/4" dual exhaust system and turbo mufflers.

My question is whether I would see any benefit from an H pipe in this particular setup. It wouldn't be that hard or expensive but I don't want to waste time and money if it would make no difference.

Thoughts will be appreciated.

Just for interest,
Here's the mock-up of the install:
After I get everything fitted I'm going to remove it all and do a cab-off restoration.

 

I like that setup.....should be trouble free and very street friendly. I think and H pipe won't hurt anything. There will be a small and I mean very small gain. If there is room to do it, go for it. If its a fabricating nightmare, then I would opt out.

 

it will make a difference in tone as well. going with turbo mufflers, you wont hear a difference. its totally up to you. I like the sound of a v8 without an h or x pipe more myself

 

Some vehicles actually benefit much more than others with an H pipe (5th gen mustangs with 5.0). Heartthrob exhaust has determined this by their results on the dyno.