you'll laugh at what I did on my 63 Catalina drag car 455 TH350.. instead of stock transmount and clearancing the floor I did no rear mount but did a 1.25 straight square tube crossmember across frame direct bolted in and drilled two half inch holes and used some 1" pvc cut about a inch long as spacers to rest on the tail housing where thhe mount bolt threads are and ran 2 SBC 7/16 shank head bolts with a shock rubber gromet on them as a washer thru the square tube bottom up into trans case so my crossmember is also the mounts. Has worked great so far 1.6 sec 60 ft times wheels up . Seems stronger to me against twist as the trans mounting mounts to cross member are much further apart now vs like a single stud like some.
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63 Catalina coupe 455 budget drag car 11's 1/4 , 7.4 1/8th
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