E-street vs Promaxx vs 440 Source

PRH said

448, stock crank, ly rods, heavy trw pistons, 260cfm 906’s, Torker 2, 850 carb, 2” headers.......3670lbs.......10.60’s @126

That was In the mid-90’s.

Short block built in 1981, was my daily driver back then.
Drove the car from Sacramento Ca to Vt in 1983.

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So a 448 is telling me that this block had been machined and bored? ly rods? Never heard of them but it leads me to believe they're not Factory... Aftermarket pistons?.. I assume all this was balanced?.... I wonder how much that tidbit of work would cost over 40 years later in nowadays terms?...
Also you seem to be completely making my point that this was a good foundation start. Not an old factory motorhome motor... It was rebuilt with a little forethought put into it...