Flywheel part#/ swapping from 273 to 360

[Kidd]

Hello all, My car is a 67 Barracuda w/ a 273-origionally a 3 speed car on column.
About 5 years ago( maybe 6 or 7) I broke the origional column shifter drag racing it...shocked?LOL So, having alot of extra parts I decided to put in a 4speed, and floor shifter.Had to find out the hard way from Brewers Performance that I neded a new bellhousing, flywheel, and incedentials.
Fast forward to now-The car runs and drives fine! BUT-I built a 1977 360 into a stout replacment.I am trying to gather everything for the swap and in doing so thought back to the flywheel I bought.....so my question:
Are there part numbers on the flywheels to distinct from internal and external? Can either flywheel be changed into the other? I DONT remember exactly what I bought from them, other than it is a 10 1/2,so I am trying to make sure of what I need to order from them again, as I need a pilot shaft bushing, and might as well do a Z-bar rebuild too.
Sorry for the long read, just trying to give all the info, and I am sure I missed something( my mind is faster than my fingers.LOL)
Thanks in advance!!Andrew/Kidd

 

[Manicmechanic]

Similar to a swap I did 318 to 360....flywheel can be drilled to match externally balanced 360....a good machine shop can do no problem.

 

[rumblefish360]

Was the 360 built as a internal balance engine?

 

[Kidd]

Looks like I will have to call the machine shop, and dig thru my reciepts to see what I can find.I built this engine after my mom passed away while building the drag engine for my 62 Valiant.....payed the 360 off, and 2 days later my father in law passed.Then....it has sat.Its all a blur. I do remember I bought a new scat crank for it.....geez,I feel like a heel that cant even remember! Sorry.....gonna start looking now before work.
Thanks for the help so far, I did buy a new Summit Balancer for it, I can get the numbers off it, and that could tell me alot.

 

[Kidd]

OK, Summit Racing is a life saver!
Called them, and asked about the crank shaft, I bought a complete Scat rotating assembly.Internal Balance!!, I asked about the balancer, and yep, I bought that the following week.Internal balance. It looks like I need the flywheel to be ZERO blanced then?

 

[hemichuck]

If your motor is neutral balanced then the flywheel you have will work fine.Remember that the harmonic balancer has to be neutral balanced(like a 318) also. If you bought a new one they might have weights that can be added or removed to make them internal or externally balanced.