Speedway Motors Cast manifold clearance

[fatcity-g]

I put a 350 crate motor in my '69 panel, and the original exhaust manifolds have cracked. I know this is common, and I want to replace them, preferably with another cast manifold. I came across a new design Rams Head from Speedway Motors, but it appears these dump straight down, without the curve to the back like stock.

Anyone know about these, or have tried them? Will they fit a '69 Chevy without some bizarre tubular yoga? I would like to avoid headers, as my rig has virtually no insulation, and I don't need any extra heat.

Thanks in advance,

Greg in Littleton, CO
'69 Chevy Panel delivery
'56 Willys wagon