Appreciate the info bud. Only benefit to the 1-3/4 is clearance IMO. Otherwise, I'd think the 1-7/8 would be better for having more room to grow. I'm going to stick with what I have. They are already on the car. Minor dent in the primary to clear the steering shaft and I'll be golden.

 

This. The steering shaft to primary clearance is a bit more than 3/8" with stock motor mounts.

Disclaimer: This could be a product of mine having been special ordered with the D-port flanges, so the headers were more of a custom build as opposed to the standard build.