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What type of 4 speed? A car's like a Mustang Toploader T&C or a BW SR-4 from a Mustang II? or a pickup BW T-98 or T-18, or NP 435or the 4 speed OD from 79 F-150's? Do you need a low first gear or an easy shifting closely spaced ratio car 4 speed or even a 5 speed like a BW T-5 or a Tremec? For a truck 5 speed go for a NVG 4500.
The SR-4, and T-4 four speeds from the Mustang II cars are not a way to go, nor the average salvage yard T-5. Way too light for a 390 V8 truck, plus there are no bells available to hook them to a FE block anyway.
I'd suggest the OD version of the 4 speed top loader. Most folks don't seem to like them so should be cheap. They give you overdrive top gear, important in these days of high priced gas. See www.5speeds.com