How to find part numbers for a 1973 Barth with Chevy 454 chassis?

I am wanting to get the brakes, suspension and drivetrain lined out before I work on the engine and house side of things for my "new" Barth.

I've decoded the Chevy partial vin, but not sure its really helpful beyond that.

CPZ373J115923
C = Chevrolet
P = Partial
Z = 454 Engine
3 = 1 Ton Series
7 = Motorhome
3 = 1973
J = Assembled In Janesville
115923 = Build Sequence

Are the from disc brakes really from a 1 ton truck parts?

I need a new ebrake cable, is that also a 1 ton or is it custom?

Also I have the 454, it needs headers / exhaust manifolds any suggestions?

I am considering replacing the belts and pulleys with a more modern system - anyone done this to increase performance?

And I like the idea of using propane addon as a switch to second backup fuel source, anyone do this to a Barth?

Rockauto.com and NAPA are good online sources for numbers as well as parts.

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Also I have the 454, it needs headers / exhaust manifolds any suggestions?

I like Thorley headers, and X pipe, Afterburner mufflers and side dumps. Any good turbo muffler works OK, though. If you do not do X pipes, you might not want a turbo muffler with duals, as it has quite a hot rod sound.

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I am considering replacing the belts and pulleys with a more modern system - anyone done this to increase performance?

Probably not worth the trouble and expense.

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And I like the idea of using propane addon as a switch to second backup fuel source, anyone do this to a Barth?

There were a number of Canadian P30s with propane conversions. Maybe try a new thread with Canada or Canadian in the title to get the attention of Canadians who might have information.

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Rockauto.com

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P30s

Ahh I think that was the magic numbers I needed to get my brain working right on this...

1973 CHEVROLET P30 VAN 7.4L 454cid V8 (Z)

I take it the drivetrains for these were partials for that.

Offhand does anyone know how to figure out the wheelbase of '73 25 foot chassis without being near it? I guess I should just measure the ebrake cable to see how long it is but that's a long drive for now.