Hi,
I have a '46 1.5 ton that I "refurbished" (meaning good safe working order) and use all the time. You can get 99% of your mechanical parts from NAPA or equivalent auto stores. In hemmings you can try Roberts, Andy Bernbaum for other stuff i.e. weather strip, gauges, rubber parts etc. I just rebuilt my engine last year and had no problem buying pistons, gaskets etc through regular parts sources (Sealed power, fel-pro etc.)Though you may have to get your parts guy to look up the part in the paper catalog rather than the computer. Your engine is slightly smaller (217 I think) but all parts available for that. Brake shoes you might have to have relined, but there are plently of shops-probably someone local.
have fun!
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Scott T.
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36 Ford 1.5 Ton dump
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50 Chrysler Windsor
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67 Cutlass 2dr post
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83 Regal 2dr w 430 v-8
88 Lincoln LSC