4 speed conversion. Help or hurt value of car?

AJ/FormS said

FWIW; I would, if funds are available go 5 speed. With an application-specific rear gear. You will never regret that extra gear. 340s love 11/1 starter gears.Normally that would be a 2.66 low and 4.10s. Well that makes touring a pita.But an o/d gear could bring those 4.10s down to 2.7s or 2.8s, a very nice hiway gear.

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This x100000.

I'm doing a TKO 600 swap in my factory 4 speed car and i will tell you first hand that it would be easier to start with an auto trans tunnel then a 4 speed hump and tunnel so why not skip a step and move to 5 speed? By the time you find and add up all the stock swap stuff you'll probably be a good 65-75% to a full TKO swap.