I've done a similar concept. took a 1947 ford 2.5 ton former well drilling truck, shortened the frame 2-1/2 feet and installed a 84x102 aluminum flatbed on it. front end I used a M2 kit with the matching lug pattern to the rear out of a 66 ford. that one has a 347 stroker with an AOD trans. 85mph+ is no problem. cruises like a modern truck, and has A/C!!!!. did the same for a 1950 ford F-5.
as for a market, I have not tried to sell these two particular trucks. although, without labor I have $23,000 in the '47 and $18,000 in the '50. so figure you would have to ask upwords of that.
currently I'm building a 1952 chevy for resale. was a 3600 stock which I am turning into a 1/2 ton with M2 front, S-10 rear, 305sbc, 200r4 trans and all modern upgrades minus A/C. Figure I will need to get about $20,000 for it when i'm done to make anything.
but it all depends on the quality of the build and what you have/want to put in it. you know $800 for base/clear paint or $150 for single stage enamel.
in street rod type vehicles I've found in my shop the customer gets what he wants to pay for and they have a budget. so while most like my personal vehicles, the cost is out of their range they are usually of the more budget minded.
in summery, building what is called a spec vehicle to sell, can be risky as street rod buyers all have different desires. feel free to ask questions, good luck.

daren
ps doing all the build yourself?


1952 GMC 1-Ton
1946 plymouth
1947 ford
custom builder
http://www.doublegcustoms.com