I am putting TBI on an 87 305. THe 305 did not have the blocks in the intake gaskets and was carburated. The origional engine I took out of the veicle had a tbi and the rear ports on both sides of the intake gasket were blocked. Should the ports be blocked or open? Does it matter?
Thanks,
John

yes the rear ports should be blocked, if the orig were

it all depends on the intake manifold you are going to use. if the original engine was tbi check to see if the heater hose to the heater core is a quick disconnect on the back of the manifold's passenger side,if so those gaskets will have to allow for water to pass through the back of the intake or your conversion will cost more than you might want it to.