I just did a similar build and if I was to do it all over again id go with the following... I'd go with a bigger cam like a stage 2 from intense, take the heads in and get them ported and machined for the cam specs and assembled with 130 lb springs, just port the Gen 3 and lim off the l67. Double roller timing chain with machined timing cover. 60 lb injectors, high flow fuel pump with wiring kit. North star throttle body, headers and 3" cat back. E85 tune. You will need a beefed up trans too.