454 full roller,je pistons,emi exhaust,holley double with hp500 intake. Motor is being rebuilt after 20 hours due to problems that are related to builders shortcuts. Not happy went to another builder and redoing second time. Heads loose blown head gasket ., rins that never seated fully.This time we are dynoing it and adding Dart heads, Higher volume fuel pump. Last motor did around 70mph. hoping to get same or maybe 1 or 2 mph faster.