So there may have been a second R5 engine?… That’s interesting…. If there were a second (or more) R5 ‘long block’, I’d think it would be a stretch to believe there was a second (or more) set of the peripheral parts unique to the R5…
I certainly could be wrong, but it’s hard to believe there was more than one plenum chamber, L&R intake manifolds, custom bracket for the dual blower setup, special blower, idler, and crank pulleys, Novi injection pump, etc…
I’d guess the R5 parts Mr. Cone wisely purchased from Paxton years ago are ‘one and onlys’ whether they are installed on the original Bonneville block or not…. Ed