The ol' 450 was a real workhorse! I put a little over 20k miles on my '73 and made several cross-country trips of over 1000 miles each way. I kinda miss it and would buy another in a heartbeat if one ever crossed my path...
As far as CO2 is concerned, you can probably buy a compressor for what the several cartridges it would take to fill a tire cost! The slime is a preventative measure, not like the "spare tire in a can" crap. Ed, how much was the "Slime" pump? It appears to be considerably smaller than mine, it's a Campbell Hausfield from HF and it's abouit 8"x6"x3"...