Dang - I had a long reply done and the computer yak'd the damm thing
Bottom line - sure, the 'kit' will fit your 327 ... you're just not gonna see anything near that HP (445) out of it.
And, even if you did it wouldn't be for very long
You need a dust-pan more than fuel from then on
They used a larger displacement (383+ maybe) bottom end to see those numbers
You'd be better off to assemble a nice engine from parts that match your needs.
You need to make sure your bottom end (crank, rods, bearings and pistons) are capable of living with increased loads form high outputs.
You can buy nice matched sets of aftermarket heads for under $1k.
You can find a nice streetable cam in the 268~274 range to give you great bottom end and HP output.
Matched to good intake/carb. combo and a free-flowing 2.5" exhaust system and you get a vehicle that responds well for driving as well as builds good torque/HP numbers and responds very well for performance driving.
You need to inspect the bottom end (crank, rods, bearings and pistons) to be sure they will also handle this increased output. I'm not saying you need to build it 'bullet-proof' - just use good parts and it will last at HP levels under 400hp for a long time.
You can do all of this for @$2.5~3k if you are carefull about parts selection and do a little hunting for parts.
"Torque" is what you're looking for for that tire burning stop-light launch feeling that your butt will love!
Remember that GM got 300+ HP out of these engines with 1.94" valves, relatively small intakes and carb.s and very restrictive exhaust systems.
We can do even better with med/low cost speed stuff available to us today!
I'd go with a set of good aftermarket heads (1.94" if stock style exhaust & 2.02" if you're going to upgrade exhaust to headers and good pipe/muffler combo), cam in the 268~274 range depending on heads, a good intake/carb combo to match your driving needs and a good quality rebuild of the bottom -end if it's needed.
I think you'll like the combo and can always build a dedicated higher output engine with more displacement later