Raw Fuel smell means the vapors are getting out somewhere.

To my knowledge your 87 El Camino has the same tank as the 85+ 4.3 TBI trucks but a different sending unit. I would use a stock tank...

As for your detent cable it would help to know which transmission you are using. I am guessing you could use a throttle cable for a F-car in your G-body Elcamino. On my 1983 G20 van when I TPI...

Same fuel pressure, different injector flow rating. The 305s used 19# injectors and the 350s used 22# injectors.