You have some serious block machining to do to a stock case.
Today, I would not use a stock case for the build. Dart Sportsman for that.
Cam to rod clearance also gets VERY tight.
I would not suggest you attempt to build this yourself without some engine building experience.
Go on youtube, a lot to be learned form big builders there. As for me I have been putting engines together since 1975 when I stuffed a 427 Vette engine in my Dad's old '65 Impala. I took out the 283 to see why it smoked so bad and found out why, all of the piston rings were stuck to the pistons. That's what Dad got for running Pennzoil at the time, lol. He switched to Texaco Havoline and never had a lick of trouble engine wise with any Chevy he owned after that. Porting heads though is an art and I do not claim to know a ton about it, just enough to make my engines a little faster than the other guy.