In 1996, the Tremec T-45 five-speed transmissions were introduced for use with the new modular engines. Because the bellhousing pattern on the T-45 is modular only, it won't work with the pushrod engines. However, it would be a good choice for a vintage car with a modular engine conversion. The T-45 is rated to handle 375 lb-ft, so it's pretty stout. This transmission is plentiful in salvage yards, so you should be able to find a good one for a reasonable price.