1971 chevelle ss 402?...

[TURBOSCHILZ]

Hey there guys, this is my first posting on here, so please be patient... Alright, I've got a 1971 Chevelle SS that I've had since high school back in the 80's, original 350, 245hp 2bbl, auto, floor console shift, green on green minimal options, but it is a true SS... I'm in the process of restoring it to it's original glory, but am opting for a 402 bbc and putting the original on a stand for the future (just want the extra boom boom if you know what I mean)...lol... I am extremely detail oriented and will be putting every stock part on this car that it would've came with out of the factory, if it were a 402 car of course, so I need MULTIPLE original part numbers and maybe a little help with decoding some castings...

1. First and foremost, I've recently picked up the 1971 bbc, casting #3969854, head casting #3993820, it is stamped "HI PERF PASS" on the block, can anyone please give me any additional info on this motor, torque, hp ratings, cam size, etc.?...

2. I need to know what all is interchangable from the 350, the car is 100% original with all original parts on it, so I need to know which parts were used on both applications to save me the hassle of purchasing parts that I already have, plus save me some cash...

3. Last but not least, I would like to establish a list of ALL required part numbers for the stock pulleys, starter, distributor, carb, etc., etc... Basically I would like to know any and ALL original part numbers that would be associated with the 402 LS3, particularly the 300 horse model, which I believe there were two available 300 and 330, is this correct?...

Thank you in advance guys, you guys are the best...
Jeff