On the firewall to the left of the wiper motor
Closed end of the filter goes into the carb first and the spring goes into the open end.
on my 1968 lemans I removed the grease cap then removed cotter pin and nut from axle and it will come off both wheel & tire of course your brake shoes cannot be to tight on drum
6 degrees advanced, or BTDC.
Factory stock ignition timing for the Corvette 327 ci 350 HP is 4 degrees BTDC.
4, to 8 degrees.
4 degrees before top dead center.
What is the bolt pattern on a 1968 Pontiac Catalina
Timing Chain.
The degree timing for a 327 cubic inch engine for a Chevrolet Corvette with is 4 degrees before top dead center. This engine is rated at 300 horsepower.
For a 1968 Cougar with a 302 ci/ 2 bbl carb, you will want to set the timing at 6*B from TDC
See Link.