Well, what I was really trying to say is that the dogleg heads want to flow way more than you'll be asking of them. You would get more bottom end by using '69 rectangle ports. So, if it was me, I'd try to find a 68 or 69 390, and save the 401 and 291 heads for a project that needs them. Actually, there is no reason to use the forged crank & rods in your application. You could do most of the same stuff to a 343 and end up about the same place. Then you could sell the 401 stuff to me!!!

Why don't you lose the torque-tube and 3-speed???? Nostalgia is one thing, and that has it's place. Please don't embarass the rest of us AMC-ers by mating a 401 to that driveline. I don't want to insult you, but you WILL be insulting yourself if you do that deed. You will be getting rolled-eyes not only from the off-branders but from fellow AMC-ers, guaranteed. Why not just keep the original driveline in a pile somewhere and go 401, T-10 (or 727), and 9-inch Ford? I promise that you will be glad you did. Odd combinations begin, and end, as headaches, and land on the scrap heap.

I just got my 3rd UR-18. My second one was a Wally Booth Prostock item and had his name stamped rite in it. Unuseable unless you had the Prostock heads. I offed it for $450. I just got a STR-11 that will someday be on my 401 in my '71 AMX. You don't even want to know what those are going for these days!!! They have been doubling every year for the past several years.