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A B20E is as easy as pie. It's all bolt in. Not counting any D-jet stuff, you'd most likely want to block the injector ports and run the carbs. And it would be well worth the effort to replace the PV's puny single downpipe exhaust manifold and the rest of the system with the B20's manifold and downpipe. Years ago I plucked the very tired B18 (mostly stuck rings) out of mine and dropped in a B20. Keeping the same manifolds and trans made it a 4 hour job.
The B21/23/230 F/T OHC engine is a different situation. It's certainly doable, and google around a little and you'll see a few of them ripping up the roads. But it's out of the realm of more casual shade tree mechanick-ing, as it requires some fabrication. But in general theory, make some custom motor mounts (the B18/20 engine mount brackets won't fit on the OHC block, and bear in mind that OHC brackets custom made for a 122/1800 won't work well in a PV). Then swap the oil pump and oil pan and oil pickup tube from the B20 onto the OHC engine. In general terms, however, normally aspirated OHC motors don't really make any more power than OHV engines can, given the same attention. Of course, the turbo OHC motors can make plenty of HP pretty easily, but fitting all that plumbing in the nose of a PV is even harder than just putting an OHC motor in.
The M410 transmission is also not easy. The PV cabin narrows around the front footwells, and they tried to retain as much as possible by making the trans tunnel as small as possible. It really hugs the 4 speed trans, and pinches down around the tail end. An OD trans doesn't have room. Fitting one in requires chopping out a fairly substantial part of the trans tunnel and replacing it with something larger. I used a 122 tunnel in mine. Took several angle grinder wheels and most of a spool of MIG wire. Well worth the effort though, the car is actually usable at modern freeway speeds. Before, it just felt abusive to have the engine wound out enough to go 75 mph. Now, it's almost relaxing.
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'63 PV544 rat rod, '93 Classic #1141 245 +t
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