EARLY A body hooker header install P/N 5208 UPDATE!

Stabbed the engine/tranny yesterday to finish up the fenderwell cuts.
I started the holes with a 4" hole saw but still have a bit more cutting to do to get the headers to snake thru and fit.
Anybody else finish up these smaller holes and get the headers to fit?
I'm going to try and make them as small as possible but I can tell already it's going to be a frustrating process of putting on and taking iff the headers and slowly cutting away sheet metal. -Mark