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Re: What type of cam would be in my stock 350
Looks like '87 was the first year for roller lifters. If you can shine a light through any of the head drainback holes, you should be able to see the tops of the lifter bores are machined flat and look for the spider hold-down bosses are in the middle of the lifter valley. Chances are you're flat tappet.
As long as you don't get radical, you can get a better cam for your engine. Newer oils are low in zinc, the newer roller motors don't need as much but there are still plenty of 'em on the market that are fine. New cam break-in procedures MUST be followed to the letter. Research oils and cam break-in.
As long as you're not going to overhaul the engine, there's not really any good reason to spend the money to upgrade to rollers, just watch what oils you use.
I am not familiar with propane - I'd bet you could find somebody on the net that knows what's up with that fuel and cam selection. I'd keep it small, under about .475 lift. Best towing cams I've used were about 210 - 215 duration with 114LSA.
If your tranny isn't computer controlled, it's a 700R4...
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