I am putting a computer carbed 350 with Vortec heads into an 85 T/A that has an L-69. Do I use the same harmonic ballancer that came with the 305 with the new 350 short block? Also what 4 barrel intake manifold for vortec heads will fit under the stock T/A hood?

 

If you are using the same belt system as the HO engine did, then you should use the 305 balancer.

 

Without a doubt, the Performer will. Not sure about the others.

 

Which "stock TA hood" is it btw?

 

So if you go with an aftermarket balancer for the 305-350 swap, you can't use the stock belt system?

 

AFAIK, you can, but the HO's belt system is designed to use a thinner-that-usual balancer, so the stock crank pulley is 'modified' to work with that balacer.

Basically, if you go with an aftermarket balancer, you can either get a thin one, like the HO used, or get a normal one and a crank pulley to match.

I *think* this is how it works, but I might not be 100% correct. I'd wait for someone else to agree/disagree with me before you use what I said.

 

Do you happen to know what size the stock one is? I may just end up getting one from napa for my swap.