A BBC? Probably little bitty ones. You probably won't have much room.
You got that right.
When I first bought mine it had either 1 3/4 or 1 7/8 in primary tubes and other than the mechanical clutch bellcrank they fit fine.
Then I went to the 2 inch Hookers and it was a different story.The lower right side control arm bracket needed surgery to fit the headers.
Then I switched the Brodix Race Rites for the AFR heads with raised exhaust ports and this presented more fitment issues.
It took four of us with two sets of oxy acy torches and two big bars to bend one tube for a little extra clearance.
Then because of that my Powermaster XS starter wont fit..
Lots of fun LOL
Guy