I would imagine the roadmaster frame would be way wide for that 37, as well even though the roadmaster has a frame it still requires some support from the body, you would be better to use the front of the frame and make your own rails, but even then the bulky frame from the roadmaster would be visible

I would find something that is narrower or just put a crossmember in it. I feel you would have to keep the body so high on the frame for front tire clearance you would never make it look good. ,,,,,,,,,,,,,,,IMO
TMJ

yes it is rotted and crushed 

Yeah,Roadmaster frame will be almost twice the width Derek,drivetrain would be ideal but like the guys said, an S10 chassis would be a much closer starting point.buy a long one and alter for wheelbase as required,S10 chassis can be shortened quite easily.

I had an s10 frame on my 38 chevy 2-door hump back, it fit good. Only thing is the front of the frame is long, so you have to cut down the frame to get the fenders to fit, but then you cut out the steering box mount, so you have to use something else for steering. You also have to cut the lower fender mount/firewall corners because the frame is wide. Also if your going to run a small block chevy, the engine sits very far forward! But they do make a motor mount kit that moves the engine back, but it's kinda weirdly looking.

But this is your best bet, they are very cheap and easy to find. You want a regular frame not a long one I believe the long one is like 123" (too long) 

I saw one on kijiji a while ago with a rear 4-link would be perfect for air ride. I'll see if I can find it

found it kijiji

 

-- Edited by Newagerod on Tuesday 22nd of April 2014 10:45:10 PM

Cowl width and front frame horns are always the difficult part to overcome.

I'd look into the Dakota frame set-ups myself, rear steer so you can slice off the front horns without any difficulty, lots of upgrades available and they also include a factory V8. Just watch out for the 6bolt set-ups.

here's one:

http://www.kijiji.ca/v-cars-trucks/city-of-toronto/1998-dodge-dakota-sport-pickup-truck/587434720?enableSearchNavigationFlag=true

 

I think the early ones were rear steer box, then switched to front rack but I'd have to dig into it some more (getting old!). lots more room than the s10 up front though regardless.

crankshaft coalition has some details on a '40/dakota swap.