340 main caps

I picked up a '73 340 block for a good price ($100). Realized when I got it home that the caps likely are not original to the motor, mainly based on surface condition. Motor is standard bore and if/when I build it will get a 3.79 or 4" crank but won't be a max effort build. Strong street and road course motor. I realize that I'm going to have to have it line bored now, but is there anything else that I need to look at on them? It there any benefit to a set made from alloy steel in this type of application? I can machine and grind a set pretty easily and they'd get honed anyway.