You didn't upset me. Why would you want to run the 20r lower end? I don't understand. I will take some pics tomorrow. I have a hand full of guys asking me questions wanting to see different things. I'll try and get to it before my sons birthday party tommorrow. I'm running 22r lower end which give you the double row timing set and the pop up pistons and I'm running an older 20r head. They have swirl port, I am running the one with out a fuel pump boss. I was told they flow better. I'm not sure if that is true or not. I went with the 22r valves and the aluminum rocker arms with an adjustable timing gear set and a mild cam. The truck actually works really well. The point to me was to build a performance 22r on a budget. You have to be careful trying to get a 22r to perform well because you can spend an arm and a leg. I wanted the higher compression to take advantage of the propane. Propane is 107 to 110 octane. I'm telling you this thing is sweet. I want to say the motor cost less than a 1000 to build with everything. I hope this helps. If I was you I would honestly bight the bullet and just buy the gotpropane stuff. Oh and I'm running a factory 22r head gasket from Toyota... I think if you were to run a 22re head on a 20r it would require a lot of machining to make it right. You may be able to bolt a fuel injection set up off a 22r on the 20r head, or you could modify an intake to make it work and you would have to make a spot for the knock sensor but I'm pretty sure it's possible. I have taken a third gen fuel injection set up and bolted it to a 84 and prior head, it turned out great. I hope this helps.
