hardtail

Hello all, I am hardtailing a 77 frame, and only have the front half of the frame. I need to get some reference measurements to start from and have been unable to find it on the net or elsewhere and do not have access or know anyone with a complete bike or frame. I would like to get a...

-Just bought this bike not sure what generation frame, not sure if engine generation belongs to frame. -It is a hard tail it starts up right away (currently cold here) shifts sound a little “loose / clanky” Whats it worth, what kinda troubke shooting/ maintenance can I do (aside from the...