I'm going to replace my w2 340....its been a long time since wrenching it..when it comes to gen3 I'm clueless...my powerwagon runs fine so I never had to work on it.. 5.7 gen3....I'm looking to put together a engine 900-1000hp for my 69 swinger......procharger.....what's needed to achieve close to that HP in a gen3.....I threw this around in other forums here also...
Find a hellcat shortblock and put some eagle heads on it .
Invest in a GOOD management system.
Have fun on the cheap.
Hell use a 5.7 eagle engine with a good management system and work out the bugs.
On a sidenote IMO forget about the R3 route. One simple reason is none available.
G3 blow up a block and find another one real easy.
Stock heads kills anything out there.
G3 has issues with rockers and cams but it slowly being sorted out.
For now the stock stuff works in 99 percent of the builds out there.