connecting rod bearing size?

A few thoughts.... I also like tensioners... but that chain needs to be replaced witha performance roller version. Summit (brand) has some decent stuff that isnt too expensive.
On the bearings: Non e have spun. All are trasahed and look to be from oil starvation. That can be misleading tho. The reason they fell out of the rods are the crush is gone. Crush holds them in place and allows the bearing to achive the correct final shape when torqued. Crush is beaten out of a bearing. Detonation and/or heat and/or breakdown of the oil wedge for some reason will do it. You need a good set of micrometers to really measure the crank. It looks to me like it's not ok. Oil goes from the main bearings to the rods. And the rods dont look good at all. So either there isnt enough oil moving thru the system, or the main bearings are to wide in terms of clearances, or the rods are too wide in terms of clearances. In any event, the lower end needs work. As far as re-torquing bolts they can be re-done a number of times with no problem. But you can't over-tighten them or they become junk at that instant. The numbers on caps and rods SHOULD match. But if in the past the rods were re-sized the shop might not have re-numbered as they should have. If this was in my garage, I would be getting the crank to a grinder to check for taper and surface quality and the rods would be re-sized properly with ARP bolts. Plastigage can verify good clearances, but you can't see taper or roundness with it.