id take out the b16 bottem end use the pr3 pistons and get an ls bottom end throw in some arp rod bolts and call it a day..atleast thats what i did with mine..for the most part..but take it to someone who KNOWS what they are doin..i just had mine built spent 1500 and spun a rod bearin in 150 miles..so now i have to have it rebuilt...also u can sell ur b16 bottom end and make some money back..