Header side clearance

It depends on your engine mounts and if you have a torque strap. I have really tight clearance with my TTi headers at both the torsion bar and clutch linkage and have never had the headers hit (see pic below). But I'm using Schumacher Creative Services poly spool mounts (I have a 73 K-frame) and their torque strap.

Here's a link to their site: http://engine-swaps.com/Pages/Products.html