The SCMT on either 60 or 80 will work fine with propane. At that horsepower level, timing is not advanced excessively to make power.
Higher horsepower or extreme chips and 4 pos chips (100hp and above) increase timing and fuel delivery (hence the high EGT's) as well as other perimieters and it would be advisable for those chips to have the timing advanced removed from the programming if possible.