Gas vs propane, stock tank vs fuel cell vs cylinder

Well after posting this I found a used Impco setup an hour or so down the road from me about the same cost as rebuilding my carb which is awfully tempting, I guess the next step will be heading up to my desert property and measuring the propane tank on my RV and crawling under and measuring the stock tank location. I know I have a couple smaller tanks that would fit, but those would only be appropriate for a strip only setup...