that is the reason i did not get the tall lifters for my IA rebuild. extra machine work cost bucs and is better spent on go faster stuff. trouble is the short lifters are backordered! 
butler tried to sell me the tall lifters, but he did tell me the block would have to be machined if i used them. if u don't have mega spring pressure the short lifters and longer pushrods will be fine.
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1963 Cat SD Clone (old school) streeter
1964 GTO post coupe, tripower, 4speed (build)
1965 GTO 389 tripower, 4 speed, driver
1966 GTO dragcar
1966 GTO Tri power, 4speed, barn find
1966 GTO Ragtop
1969 GTO Judge RA lll, auto
1970 GP SSJ
1970 GTO barn find..TLB…390 horse?….yeh, 390
1973 Grand Safari wagon, 700hp stoplight sleeper
525ci DCI & 609ci LM V head builds
Factory stock oval track car
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