the thing is its either gonna run well, or not, why baby it? id rather know its f ed up asap vs next week.
the guy who built my brothers engine told him that. he had a flat tappet lifters, so he did the 3,000 rpm for like 20 minutes to break in the cam, oil change and tire smoke out the garage.
this was by no means a cheap engine, it was a early 70's 454 BB bored 30 over to a 462 iirc. and everything inside was over built. this was the mid 80's it was 7 grand in parts alone. guy who built it had built a few others almost like it and figured it was good for a easy 600 hp. it pulled 12's in a full weight 72 chevelle with slicks. it needed a higher stall in the converter or it would have been a bit faster.
that 7 g's dont include the B and M built th400, or the full posi 4.11 12 bolt rear. trans had a full manual valve body in it too. so you had to shift it 1,2 ,3. it used to break the wheels free at about any speed too. it was a beast.