r34s were sold in 4door trim as fleet vehicals (kinda like crown vics), they came with an rb20de and an rb25de. one would then assume the 2 door had similar options, for the posuers. there was never a rb30de, there was a 30e and a 30et. if you want somethin sexy, do an tb45de or tb48de and add a pair of t88s
my 30 block is on the way, or it will be in a few weeks. most of the 30de/t conversions are done using 25 bits cause they are cheap and to make real power on a 25 you have to rebuild it anyway. why not just spend the extra $$$ and give those toyota ass hats the ole hee haw. that being said you dont need to modify your mounts or hood if you use 26 bits.