I am going to swap out a tired 305 out for a new 350 with a 4 bolt main from GM. Is there anything I need to get going from a 2 bolt to a 4 bolt?
http://www.crateenginedepot.com/stor...53--P62C3.aspx

The car has a turbo 350 tranny. I am gonna get a 2bl intake of a 73 Monte Crlo from my neighbor for like $25.

Anyone want to recomend a balancer and flexplate? After I put the Balancer and flexplate on do I need to take the engine somewhere to get it balanced?

 

No
TCI
No

 

The number of main bearing bolts make no difference on installing the engine, as the outside of the engine remains the same.
The 2 bl setup is going to be very restrictive on a 350, unless you use a very large 2bl. A large 2bl gives poor throttle response at low RPM.

 

I was looking to stay a 2 bl to keep decent gas milage.

 

A four barrel will usually run on 2 barrels until you demand more power and force the second pair of barrels to open up. So it is up to your right foot as to what mileage you get. For a good compromise you can install a quadrajet which has small primaries and large secondaries. This will give you good mileage and response at part throttle, and give you full power when you call for it. You will need a manifold designed for it. The only advantage of a 2 bl is that it is cheaper than a 4 bl.

 

I'm with z28pete on the quadrajet - There are some nice aftermarket ones out there.
Harmonic Balancers - Professional Products has a nice one and try www.tciauto.com for the flex plate.

 

Cool. Thanks for all the suggestions.

 

If your really interested in the quadro.....I got one and an intake i'll let go for cheap....

 

how cheap are we talking