Alright, I'm dropping a 512 low deck stroker into my Fifth Avenue soon here. Big block swaps into M body cars isn't exactly a popular thing, so nobody makes headers that will fit. eBay has lots of cheap Chinese headers for sale and one of them is this set here:

Manzo shorty headers:
http://www.ebay.com/itm/like/11122582787...&rmvSB=true

I would more than happily pay for brand-name set, but since I'm uncertain if anything would fit I figured cheapies would fit the bill to at least get the motor in the car. I got these cheaper than what I would be able to get cast manifolds for.

The build quality isn't bad at all and it looks like they'll clear the power steering box. So I took them to engine builder's today to check fitment on the Edelbrock heads and the attached photos is what I found.

The ports are huge and leave very little sealing surface on the bottoms. The gaskets actually cover the indentations in the heads for the bolts. I got to imagine these would burn through in short order. Ideas guys? I'm thinking I should just send these back.