Your going to be way ahead to pull the engine and replace the freeze plugs.LS swaps are not that cheap.Fuel tank change,larger charging system.I have friends that have done a couple and it sounds cheap going in but ended up being way more than planned.Tom

 

New to the forum as I have started my engine swap on my 68 Firebird due to the freeze plugs rotting out in the back of the block.

Current specs:
350 2 bbl
ST300
8.2" 2.56 rear posi

Trying to find a path that makes the most sense for me right now to get the car back on the road. Listed what I've come up with as far as options starting with most expensive to least expensive.

Option 1
6.0 LS
4l80E
New Driveshaft
New Ford 9" Rear End with 3.73's or 4.10's (built by Currie)
Add front disc brakes

Option 2
6.0 LS
4l80E
New Driveshaft
Junkyard Rear End 8.5" with 3.73's or 4.10's
Add disc brakes

Option 3
6.0 LS
rebuilt TH350
Factory driveshaft
factory 2.56 rear end
Add disc brakes

Just looking for input from people who may have done a similar swap

Why is rebuilding the 350 not on the list?
In Indy, a full rebuild, including hardened valve seat inserts might run about $4k in a local machine shop. I assume this is the original motor.

 

for like $2800 you can pull your SBC turn it into a 383 and put it back in.
You wont do that with an LS swap.
This coming from a guy who does LS swaps.

 

I suspect his “350 2bbl” is the stock Pontiac engine.

 

I suspect his

yea being the year of the car, you are probably correct on that one

 

The “ST300” (B-O-P version of the Powerglide) is the other clue.

 

What are you going to use the car for? Crusing, Street/Strip, Strip most of the time, Strip always?