Moldex definitely made most of the cranks for the 305, couldn't remember the stroke but 2.96" sounds about right. NASCAR started the Grand American (Baby Grand) series in the late 60's using the shorter wheelbase 106-111" Camaro's, Mustangs, Cuda's,Darts,etc. The cube limit was 305" probably catering to Ford and GM since they already had 302" engines, but it forced Mopar to downsize the 340 by destroking. I know KB was building engines initially with the early 340 heads which weren't too competitive, but the W-2 heads changed that. Quite possibly, a lot of the short block components were compatible with the Westlake/Trans Am combinations. The series was fairly short-lived though, just never seemed to quite catch on, some of the 305's wound up in some of the last Daytona's and Superbirds as NASCAR kept trying to slow the wing cars down with cube limits and carb restrictors, can't remember who was driving the Mario Rossi built Daytona but it was as fast as the big blocks, seems like it had to run 8000+ though, which was unheard of back in early 70's, don't think it lasted the full race. The Hemi's by contrast were usually not much more than 6400-6600 on the superspeedways, at least not in race trim.