Need opinion

Ok guys,

this is part confession, and part question.

let me get the stupid thing out of the way. I've never re/built an engine, but I want to and with time I think I could do a good job.

so here's the question, I was just looking on ma Mopar's site and I saw two blocks that caught my eye

Cast Iron Wedge 440
http://www.mopar.com/m_perf_subcat2Check.jsp?SubSubSubGrpID=132&dummy5=1173413260887

or

Cast Iron Hemi 426

http://www.mopar.com/m_perf_subcat2Check.jsp?SubSubSubGrpID=25&dummy5=1173413321037

right now i know that i'm probably not going to buy directly from Mopar but i know that I want it to be a big block engine and not the \6 that's already in there. But I don't know if these can even fit in my engine bay, (74 Valiant) I can cut the hood if I need to and i'm not too worried about money 'cause this is a long ways away.

so i'd like to know which one would be good for a mostly street and ocasionally strip build?

thanks in adavance.