I have a spare 460 sitting on my engine stand, don't tempt me.. LMAO Turn my GP into a snow plow with all that extra weight up front!!!
it wouldnt be that much heavier... 40-60lbs more ish.
car-part.com would probably have some 100k+ motor for around $500 and include a ton of spare parts like a blower, heads, etc... that you could part out.