Jack Cottons has been around for years and will be at the buick national in NC this year
it looks like you're buying a parts list not an engine service , place the order and youll get the parts
if you have any questions or want to have them install those parts pick up the phone and call him during business hours and you can talk to Jack .
stage 2 includes 61 turbo ,champ iron heads , arp head bolts , roller cam kit , injectors , alky injection ,TT chip, valvecovers , stretch intercooler and converter .and should be fine on a stock bottom end and should be good for high 10 low 11s with proper launch
you'll needed to have a good condition or properly rebuilt stock bottom end , all engine gaskets to install the parts , a good working trans rebuilt with at least a shift kit from a good builder , ignition system with no issues , upgraded fuel system(255pump w/hotwire ) and exhaust (downpipe and catback), proper suspension (no worn out parts , air bag or upgrade swaybar at minimum ) + tires for the power , and your wiring needs to be in good shape
stage 3 has XFI and champion GN1 alum heads , 64 turbo fmic and more ... could get lucky bolting this all on the stock bottom end and do well if you keep the boost down but this package should have engine upgrades like full forged rotating assembly and main caps or girdle, better built trans with some billet parts, upgraded axles and driveshaft