I am unsure of any difference in weight right now. I did find some threads about having to resize the big end when using the ARP rod bolts due to higher clamping force. I wasn’t sure if the rod bolts could be reused (torque to yield?). I would change the nuts at a minimum if staying stock.
I picked up the ARP bolts at a great price (about 40% of going rate) when I got the car. Always looking for bargains! (like the practically new custom Ultrashield lightweight halo seat, mounts, and back brace I got this weekend for about half price =D). So if I have to sell them I will get my money back to put towards something else.
My original plan was to: surface the head, valve job, new rod and main bearings, cross drill #2 & #3 journals, 951 oil cooler, reseal front and rear of the motor, new belts, new water pump, clean the injectors, surface the flywheel/new flywheel bolts. Also baffling the oil pan and bracing/ringing the oil pickup.
Since the build time is getting extended (anyone want to buy a Harley? ;-D) and the motor is going to be out anyway, I may go ahead and re-ring as well (150K mile motor).
With the possible requirement to resize the big end, I am still unsure about going that direction.