I installed my eagle rods with the tangs on the opposite side of each other and it was torqued down. I had a hard time rotating it with a breaker bar until I realized it was backwards. I took the caps off and inspected the bearings and they seem fine, did I damaged anything? The engine was not started, it was just assembled and I realized it after it was torqued down

 

If the bearings still look perfect, I would think it would be ok to move forward. Assembly lube likely helped protect it from any damage. Initial turning/break away torque will naturally be higher than maintaining turning.
If you have a digital torque wrench, it's not a bad idea to check the resistance (initial turning and turning torque) as you torque things down so it's easier to spot a potential problem during assembly.

 

Should I reshaped my big ends on the rods? That's what people are telling me but my car never started like most people when they installed it backwards.

 

I would torque the rod caps correctly and verify the big end is still perfectly round with a bore gauge. As long as it's still round in all directions, resizing shouldn't be needed. If it's out of round, it will need to be corrected.

 

Bore gauge like for the bore for blocks?

 

Yes. Dial bore gauge for measuring bores down to .0001"

 

Ok and what specs should I look for when measuring the big ends of the rods? Thank you

 

Ideally you want absolutely zero out of round.
You might be just fine. I can't say for sure as I've never came across this problem.

I think this would be more of a concern with cracked rods where the surfaces are more prone to being damaged when forced together.
I'm sure there's some machinists and builders in here that could tell you with more certainty.

 

I just looked at a set of eagles last night and I think you'll be fine.

 

I know on the D-series engines the FSM states out of round on the rod journals when new has a max of 0.0002" and the service limit is 0.0004".

I would suspect the rods would fall into the same expectations. The FSM actually doesn't provide information about rod out of round and only specifies the use of the number stamped on it for bearing selection.

Hopefully that information is helpful.