It looks like your pistons aren't stock . And don't buy your arp stuff from lethal there are other places that are a lot cheaper .these motor aren't cheap to rebuild I just rebuilt mine I have close to 13 k in the motor and fuel system. Once you have it all back together you should really...
Get arp 2000 you can reuse them not like the regular arp which are a one time use like the stock head bolts are .make sure you use ultra torque lube on your bolts
Returned the pistons go with a -3 cc piston bump up your compression. Even with a ported Eaton your car will be a whole different beast. I am at 10.1 and love how the car drive.it makes a stock cobra feel sluggish
I had full bassina exhaust system midlenth headers x pipe and cat back I loved the way it performed and sounded. The whole set up is for sale also I took my trans out a few times with the mid lent stayed in .I would do headers while the motor is out