I did mine years back but it was about a 75 I got the head from. I seem to remember something about using the lighter rods and heavier crank, used the D cam, polished the ports and had an engine shop do stainless steel seats. I did not try to plane the head or lighten the flywheel.

I did have some valve float issues and ate a cam. I had changed the valve springs for original new ones but I think they were a bit loose. the valve stem length changed a little from reworking the head I think.. I added some shims under the springs and that helped valve float.. the balancing really made the engine I would definitely do that.
I used an original style b18 but bored it to 2 litres.. I ground the rocker shaft down .020 and fitted all new bushings but reused the rockers which are bit hollowed out.. I made thrust washers for the edges of the pillow blocks. I used the 2 liter jets. HS 6 carbs the 67 exhaust manifold with 2 into 1..

I think it didn't have enough advance so i used a vacuum thing meant for a retarrd... somehow flipped the servo thig over to get more advance,, I somehow got it to work like that.. the distributor is from about a 74 and I took the electronic ignition module with it. it could probably be recurved more scientifically but it runs fine,, really lugs and it revs fine to about 6000 and sounds nice.. I kept the OEM peashooter exhaust. I had a cutout thing on it wiht a ball that opened up under high backpressure but it rattled,, I ditched that idea and plugged that off. it looks pretty stock if you don't notice the big valve head..

It really flies, I put in OD and lower gears,, I like the heavy flywheel its like driving a car with a gyro feature.. sure I have to pause when i shift but it's fun like that I can wind it up like a top. ;-)

If you do too much you will just want to drive it like you hate it because you can and it's fun and you can race old ladys in their new hondas without them even noticing. !