She's getting a heart transplant from a junkyard 350 to a fresher 283 and I'm tired of running VW bug size tires up front, so the fenderwell headers have to go. Since there isn't a lot of room with a Saginaw 525 steering box and under the floor master cylinder. How have you gotten the exhaust out of your SBC in a fat fender? Standard cheapo block huggers have to make a REALLY tight 90 turn to clear the steering box.
Both my 40 pick up and 40 wagon have corvette style center drop manifolds and some creative head pipes on the drivers side to clear the GM steering box and oil filter. Oh yeah, then there is the clutch pedal in the pick up. Both cars all is tucked up high so lots of bends.
My 47 had these installed when I acquired it, so I don't know who made them. But yeah, you're right, it is a tight fit on the drivers side. Not bad on the passenger side.