Getrags are far stronger than T5s, nicer drives too but they are uncommon and expensive.
A tremec TKO is the strongest 5 speed all synchro box available - people have been fitting them to 454 powered cars for years. They are available new from Mal Wood Automotive in QLD in a choice of ratios.
I was quoted $6000 or so for a kit for my HJ sedan with aussie pattern 308 which included a new TKO, new bellhousing, new 11" clutch and new shifter.
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