I agree home ported J's 11.0 to 1, small solid 244 @.050 tti headers and it's probably a honest 400 hp on my 360. 450hp is going to take some very good flowing heads and a big cam to make a HONEST 450hp in a little 340 and that 450hp is going to be up hi in the rpm range and not a very street friendly setup. I would have to say the vast majority of stock stroke 340/360 with ported stock heads and the usual HIPO bolt on's are UNDER 400hp!
