PB dizzy is too thin (smaller diameter) so wont fit in the hole properly. You can make up a spacer ring to make it sit in the hole nice (used to be able to buy them from somewhere) but easier to just fit 2e dizzy.
I have recently done a 2e bottom end conversion with schrick 276 cam and slightly modded head, defo has more grunt but tbh for the money it's cost me to build i was expecting more and wouldnt bother doing it again. But i needed an engine and quick for a trip to the ring.
Money is now being saved for 20vt conversion only a few months after doing the 2e stuff
