I did 2 S13 Blacktop swaps and helped with a Redtop in a S14, and we found that the AC bracket they mention on heavythrottle does not work. I called them and they sware it can work I just dont see how. Other than that they are great guys.
You can buy Redtop Motor sets for like $2100 if you look, and Blacktops for $2300. Beware of the $1500 motor set I have yet to see a complete one at that price.
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I have no personal experiance with the RB20 but from what I read I wouldn't recommend it. I am sure they can be great motors but - there is less info available, parts are not as common, and they tend to be older / high milage.
I got a 95 S13 Blacktop Complete motor set $2200 with about 44k verified miles. The motor was clean, great compression, and it fits perfect because it was made for that car.
Just my opinion do what you want.
