need advice 400 sbc

[sev85]

Hey guys its been awhile since i have posted here but i need some quick advice i recently blew up my 350 sbc i found out from casting numbers is a 2 bolt main from a 72 vette the block is saveable but i need a motor asap i have the chance to get a 400 small block for 150 complete motor runs and turns over comes with torque converter should i buy it?

i have a 1982 gmc high sierra long bed th350 stage 1 kit 203 transfer case with part time kit gm corp 10 bolt front 3.42 gears and a gm corp 12 bolt rear also 3.42 gears 4 inch rancho lift kit with 15x10 outlaw 2 wheels currently has 36's going down to a 34 or 35 mainly used for driving around some light off road and not really trying to go outrageous maybe 350-400 hp is pushing it

heres some questions i have

I have a aluminum edelbrock rpm performer air gap intake will it work fine on the new 400?

i have a set of 462 2.02 intake 1.6 exhaust heads will they be ok on the 400?

i will be using a freshly rebuilt edelbrock 6310-03 600cfm electric choke carb will it be enough for the 400?

a set of 1 5/8 to 3 1/2 inch collector hedman long tube headers to go on it to true dual exhaust 2 inch pipe with glass packs be ok for the 400?

and will the stage 1 th350 be ok on the 400?

i also will be installing a double chain timing gear set before the motor is installed and a brand new hei distributor

also i have a gm performance mild cam and lifter set should i install it before dropping in the new 400?

sorry for the book but i am supposed to head out to get this motor in an hour or two so any quick advice before i go would help greatly!!!!

thanks in advance!!!!!