I can say 3” exhaust is definitely possible with round tubing. You could also use round tube to oval tube back to round tube for the tight areas. Dennis Quella gave me that tip. If I remember correctly Stainless Headers offers products like that or can make what is needed.
By the way, your engine bay looks very nice Mike.
Thanks Everyone. I have decided to give 3" a red hot go. Cant be worse than whats there now !
I had a 3" exhaust fabb'ed for my "pushbutton" '71. Tight but definitely doable. As I recall, since I used spherebar mounts for my anti-roll-bar, that raised the bar just enough to dimple my exhaust. Car was lower than stock and with a higher spring rate.
That aside, the only other insight I can offer is the 3" pipes may be louder. I ran mine into 2-chamber Flowmaster race "mufflers". Not recommended for the street. But, mpaschetto, looks like your engine can make use of the added flow!
Dave
