I am now trying to find a small block bellhousing. I think that Chryco said that the 5.12" bearing retainer can be machined down to 4.80." Since the OD trans has the 5.12" bearing retainer and the 4.16" bolt pattern, can I only use a bellhousing with either the 4.80" or 5.12" bearing retainer size? Will the bellhousing with the 4.35 bearing retainer not work because of the small 3.70" bolt pattern size?