Not an LA question, POLY

Welcome to the wacky world of poly engines!

Looks like the original question is answered, yes the distributors are interchangeable with the LA engine. I was aware of the different variations of the poly engine, therefore my first post in this thread, still learned something new today. Looks like the poly engine can be summed up as follows;

Early hemi based polys which can be further broken down into Chrysler, Dodge and Desoto, all with different bore spacings. Hemi head versions and poly head versions were called double shaft and single shaft respectively. Poly and hemi heads would interchange within brand families, but would not exchange across the division lines, i.e. Chrysler would not fit Dodge which would not fit Desoto which would not fit Chrysler. Plymouth models used Dodge poly's, no hemis.

A engines which were exclusively a poly head, shared across Dodge and Plymouth lines. No hemi heads and I don't think Chrysler used this engine except as an industrial block. The LA engine we know and love was a derivative of this engine using wedge heads. Interestingly enough, the new hemi shares the same bore spacing (4.46) with the A and LA engines. None of the blocks interchange although the A and LA engines shared a 3.31 stroke.

What may be a new twist on all this is the 4.7L V8 currently in production. No common parts to the other engine families, but it uses the canted valve arrangement of the poly engine and looks quite a bit like the old poly head valve cover. More details here

http://www.allpar.com/mopar/47.html