Highest flowing sbm heads?

A 1320 Challenger isn't an apples to apples comparison.

I have to admit I've daydreamed about a gen lll hemi, not n/a though. I'd like to have a 78-84 SWD Dodge truck with 6.4, turbo, air, power brakes and power steering. It would be a fun driver.

It's only a daydream, I just retired and am too far invested in small blocks. Also I'm not willing to take a quarter on the dollar for my parts. Mopar guys are too cheap to pay for good parts.