That's a 1970 CAT Eliminator...Not Bad
That CAT is a 1970 model el400 eliminator and came with a 4hp tecumseh. You can get a new seat made for it... It also should have a disc caliper type brake that squeezes the sprocket and a goofy switch plate and toggle switch.. Good Luck and if you get it look at the cat photo section as we have 2 shots of ours there..