318 Threw a Con Rod. Now What?

My 318 is dead. I have a later 904 with a lock up torque convertor in the dart and a 7.25 with 2.76 gears as I usually run the highway. There's a couple 318 and 360 engines for sale in my area. I have a nice set of rebuilt and ported 302 heads sitting on my shelf along with a 340 purple cam and lifters, performer intake and eddy 600 carb. I'd like to keep this trans and plan on swapping in my 8.75 rear with 2.76 gears.
My question is, if I went with a 360, would I need a 360 torque convertor to balance it, or should I just get a 318 and build it with the parts I got? I also have sealed power flat top pistons for a 318.
What would you do?