as you know $5500 bucks in '79 was a good bit of money for a 10 year old mustang. that would buy a nearly new camaro, i did a '78 z28 in '80 for $5300. here is a pic of the 1929 hercules engine. it powered anything that could be ran with a flat belt. it was used on occasion to turn a 3 foot across saw blade for fence posts or firewood. fairly dangerous, pre osha. same uncle has this allis chalmers model g forever. i fixed it up for him after he realized he never would. he got to see it before he passed, good guy.