Hi Jack,
I have a 69 w/a BBC (std deck). I have BBC Hooker Super comp's... manual steering (stock). They are not fun to put in!! Next set will be custom made. 2 major issues: w/a 1st generation body & BBC w/ stock front end, you can see there are certain clearance issues. If I remember, one is the movement of the center link hitting the header. If you have a larger pan like me, you will have less steering availability w/ the tie rods hitting the pan when done. To me it is not that bad, but really easy to justify R&P steering instead. I chucked the fender wells, not enough room to work in there... also, invest in some 62 thousandths copper gaskets. Nothing like having to change out the crap ones & hardly any room to work. If I could do it all over again, I would pay good money to have custom fit headers!! Good luck!!