Anyone use Summit Headers?

I've installed the summit headers in 2 A bodys, 1 set fit great the other needed lots of bashing. The set that fit great went into a 73 318 car with spool mounts & P/S, cleared everything great, installed another set in a 72 340 car with biscuit mounts & P/S and 1 tube needed beat 1/2 shut to clear the steering box and the other side needed dimpled for the idler arm. I did the install a few years apart so I'm not sure if spool mounts locate the engine a little higher than biscuit mounts.