My truck has the original 261 in it, with the three speed on the tree, original suspension and brakes, 3.90 gears, and at close to highway speed, the pistons sound like they want to start changing holes. After two summers of dealing with a weepy master cylinder,I think I will be upgrading to a newer dual chamber master and correcting the factory brake line routing. I also have a 5 speed that I have been threatening to put in for three years now. The Department of War and Finance has a nice Camaro ragtop now and I would like to keep up with her on the highway.
I left the original drivetrain intact because everything worked so well, but now the brakes need looking at, so time for an upgrade - for safety's sake - and while it's apart the tranny might get changed - for convenience sake - but the six will stay - because everyone has a V-8, but maybe straight pipes, and chrome reverses, and dearched springs.....