They started as 454/420s. .040 over with mild roller cams now.

I will say this.if you never installed a trs drive,but have done bravo or alpha drives,then your in for a eye opeaner.I have always installed mine with the motor/trans installed.i hang the drive on my engine cherry picker and aline it that way.the first time I tried I could never get it to aline up.a buddy came over and schooled me.i can do it now rather quickly now.practice makes perfect.

Nice heads and cam should get you around 530-550 hp and mid 70's I would not expect much more then 74 but should see that

Masking tape on the U joints is a life save if engines are aligned right they slide right in....

Yes, last time I ended up using masking tape to tape the ujoints straight. Drives slid right on no problem after fighting it for hours before.

I have pulled my engines in all configurations. I hate putting my starboard TRS back on and will not pull the drive unless necessary.
I pull the engine from the transmission and prop the transmission up with a 4x4. When I install the engine I leave the spark plugs out and just turn over the engine with a ratchet. It aligns the coupler and transmission. No big deal.

I have heard of that being used before.another trick I learned is to use a old shaft to aline the splines before you engage.

I wind a piece of string through the forward u-joint and with the joints positioned properly I can move front yoke up down and side to side .Then I steer it in .Getting the splines to align is just a matter of barely moving the prop. If it doesn't go pull it back and move prop slightly and go again. Once in ,since the string isn't tied I pull one end of string to get it out. When trs's were common this was my standard operating procedure. Works for me. I've seen people use tape but don't like the idea of leaving it in there.

Engines are out and in the garage, went pretty smooth