do you count when you accelerate from a stop? a four speed should shift three times.

and yes ;your rpm at 60 should be more like 2500 as a rough estimate.

my sdl runs 73 at 3000 rpm. it has the 288 rear end. your car should have a 265 i think so at 3000 it would run about 80 i would think.

yes the five speed conversion is straightforward. everthing will bolt in you need tranny shifter shift rods clutch and flywheel speedo and driveshaft. maybe a crossmember too. perfect time to convert when your auto is out to lunch. the parts are out there. if from a salvage yard i would guess somewhere between 500 and 750. labor to install if hired done about 500.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.