350 hp out of a fairly stock 340

BB Chevies are plenty capable I can assure you
who said it wasnt keep up
396 350 hp over rated hp wise 320 on a good day 396-325 hp was a dog
396 375 hp L78 not over rated hp wise over rated in the vette @425 hp cough bs cough
I grew up driving and riding in 396 12.5 to 1 280@50 580 plus lift 2 1/8 headers rectangular port heads tunnel ram 2 660s m-22 3.31 gears shifting @8000 rpm 3rd gear was over 135 use to get gas at the airport 5 gallon jugs
iam pretty sure iam aware