Alright, thank you

still cant find that m1 intake

I have a M1 that I'd sell if I get an Edelbrock for mine.
Also to correct myself, 340 E/manifolds do fit on the Magnum heads as well as the 340 valve covers.
I'm also looking for some of the black cast MP 10 bolt Magnum valve covers.

Cana pro former intake manifold be drilled to fit magnum heads??n

Don't see how.

Never tried it but I read once where a guy drilled down vertical into the LA intake then used spacers under the bolt head with an angle on the lower side of the spacer to match the angle on the LA intake. If I did not have a Mag intake I would try it

Ted, Edelbrock makes a Performer RPM Airgap for Magnum motors. Summit sells a Chinese knockoff called a Crosswind. A long time ago, a Moparts member had a jig to redrill Magnum heads to fit an LA intake. If I remember right, it disappeared and has never been seen again. Check on Rock Auto for a 5.9 flex plate. The harmonic balancer and the flex plate have to match on Magnum motors. As for Magnum exhaust manifolds, there are different versions. The most common have 1 7/8 exits, and the better ones have larger openings. 2 1/4, I think?

I was one of the ones who rented the "jig" when it was in circulation. I think a person could mockup the LA intake on the longblock then make a centerpunch mark down the LA intake manifold holes onto the head deck surface then remove the intake/heads & drill/tap the heads in that location(s) which was what the jig did. If the area on the heads you would be drilling into was solid it would work fine (with the jig it was borderline)

http://www.edelbrock.com/automotive/mc/manifolds/chrysler/rpm-air-gap-sb.shtml
One difference between the Magnum and LA is the coolant bypass hose. Different size nipple and different angle.

Looks like they made 2 Air Gaps for the Magnum. I need the one that has the tower boss right behind the thermostat.

https://www.summitracing.com/parts/edl-7577