4 dr anyone?

I am just posting because I'm frustrated. My dad and brother are laughing at me that I want to speed up my '71 4 dr Dart. I'm not going overboard yet, just make the Slant a little faster. Down the road, I'd like to stick a 360 in it. I'm still going through with my plans but it's just frustrating when you have to listen to nay-sayers. I keep looking on this site for someone else with a 4 dr that they've done something to but haven't found any. I know 4 drs are less desireable, but I figured there'd be at least one other person like me out there! Rant off.