will it work

I want to beef up my 95 400 and I think a 450 or 500 cylender and pyston will bolt up but I was told by one of the guys at thumper that the stroke may be wrong. How do I find out? My goal is to have a dependable big block with all stock honda parts.

thanks in advance for the help guys

ps If this works I will have my computer sava son build a webpage with detailed instrustions to share the knowloge with all our honda buddies