The car is an 87.

 

So the 1987 305 all came with the CCC carb and distributor. The V6 had the TBI fuel injection. The good news for you is they added a non CCC carb and distributor, which make things easier for adding your early model 327. Not sure where the oil pressure sender would fit on a 327, there was an oil pressure sender on the back of the block behind the distributor but I think that was for the idiot light on the dash.
Dave

 

The 327 came out of a running car so I'm just using all the parts that came on it. ( hei and vac dist & carb, the 305 also had hei & vac dist). Everything else has been plug and play. Tac doesnt work currently ( sits at 2000 and wont move, but it was like that on the 305 going to bypass the filter and test ) and the oil pressure guage, which I'm trying to sort. I may just add a T and sender by the distributor where the other oil sensor is to fix the guage.

 

Yeah the tach filter could be bad. Only reason they have that is to stop radio noise, but they often fail after 30 years and as far as I know you can't get an aftermarket or nos one anyplace. I just run a wire from the coil to the white tach wire inside the dash.

 

Good idea if you can get a t fitting and an adapter to fit the oil pressure gauge sender to it that will solve that problem.