IPMS over here is largely military and aircraft builders who look down their noses at people who build cars and trucks. Sweeping generalisation, but they seem to have little interest in cars, much less hot rods.
The tapered hood looks like the most challenging problem. You could fill the back of the character line/crease at the cowl area then file & sand it to shape. The '60-'63 cabs had wraparound windshields; '64-'66 had the same style as your Revell pickup cab, so you could just say it's a later model. Otherwise, the AMT '60 Chevy cab could work.