When using the single-vacuum distributor, the vacuum hose runs from the vacuum port on the left side of the carburetor to the vacuum canister on the distributor. In that case, the vacuum port on the rear of the carburetor must be plugged.
For most cool season grasses and for folks living in northern climates, the best time to plant grass is in late August, early September. Depending on exactly the climate you have and the type of grass seed you're planting.
Planting grass seed in New Jersey should be done between August 15 and October 1. Seeding in late summer/early fall provides warm soils and cool temperatures that create a good environment for seed germination. Grass can be established in the spring and early summer but weeds overgrowing your grass will be a problem.