522 bottom end (10.6-1), XTQ294 cam, TF240's, QF1050AN (4150). PTC 9.5, 3.91's. 3900lb B-body. Current Holley SD

I’d say the basic combo would pick up power with the 337.
How much of a gain there would be……..only one way to know for sure.

And…….the port mismatch is probably not going to help matters.
But, it may not be the kiss of death either.
Again, you’d have to try it to know.

I’ve tested BBC rectangle port manifolds on oval port heads(which is a huge mismatch) that picked up power over their oval port counterparts.

If the manifold is priced friendly enough, just try it.
If it doesn’t do what you want……. Flip it.

The price seems decent. I'll get it. This is the one we're talking about I hope.

I haven’t had one in my shop in several years, but that looks right.

The stage 6 intakes are the same design, but are for raised port heads and are taller.

If that intake doesn't work out for you, let me know. I would be interested in it for the 500" wedge sitting in the corner. Modern ported the Eddies years ago and I think that intake would be a good fit. I would at least like to find out.

Yes, perfect intake for a set of MW ported Edelbrock heads on an RB block. You get rid of the bathtub gasket that way and the carb should be low enough to fit under a flat hood.

The 337 fits perfectly on my Stage VI Low Deck, but it has a slight 'Air gap' over the Indy Vally plate

I think Mopar Performance did a lousy job of marketing the 337 intake. I looked at it for years wondering if it would fit a 440 with MW heads. I wasn't willing to buy one to find out if that was the case. Andy finally bought one and published the results. I snagged one before they disappeared completely. Thanks to Andy for buying one and letting everyone know what it was.

I was swapping parts with a guy in Pa and he had 3 of them on a shelf along with about a dozen other BB mopar intakes.

Buy 'em up

Well it showed up today, in it's original box. I'll try it out as soon as I can.

Looks good. Be interesting to see how it fits and works for you. I had great luck with the one on my old 514. It worked much better than expected.

Like has been suggested...take a hand file, use some tape, and a vacuum 'trunk monkey' and artfully remove any down-stream interference and it'll pick the combo up for certain. Make you efforts/expense worthwhile. If it makes you feel any better you should know at Roush we'd occasionally tickle NASCAR intake manifolds ON THE DYNO to help fuel distribution. And he'd use no vacuum but blast it with shop air for clean-up. If you knew the man, you'd know he'd sell his soul for a good running engine, at that time anyway.

Comparing the ports, the are extremely close to the TF240's.

That's encouraging, at least as a starting point.

I bought a cheap(?) Harbor Freight bore scope for checking port alignment between intake and heads when installing 'em cuz you can't really see the full interface without sticking a scope way down the intake runner.

My old 337 Intake thread might have some helpful info.
https://board.moparts.org/ubbthread...mopar-337-intake-info-and-pics-here.html

How does yours go with the 337 on it?

Well, it's on. Matched up pretty good, as good as it can be. Just cleaned gaskets up some. We'll see when I get it out.

Looks great.

Can’t wait to hear the driving impressions and track results.