'452 Heads Hardened Seats

Guys,

Good morning, picked up a later 70's 440 with '452 Heads. So far everything has measured to be a real tight engine with some natural Carbon build up. Took the heads in to get Hot tanked and "checked out".
They had enough time to simply strip them and soak them over night. They didn't check the spring ratings (assumed they were stock) but had the following recommendations:
* Purchase Comp springs to match my Comp 274XE Cam (probably great advice)
* Install Hardened Seats
* Install new liners
* Install new valves
ETC: $500+Springs

Are new guides needed? I have checked the valve taper at home and they are in spec. Dropping the valves in the guides they have zero wiggle (I know I need to check with a dial indicator).

Second I thought the '452 heads had Induction Hardening Seats, will these not work with a hobby car? This isn't my daily driver, just a fun weekend car.

After testing the guides and having Factory H-Seats, the thought was to blend the bowls and lap the valves for re-assembly.

The long term goal is just to replace these with 440 Source or Edelbrock, but wanted to get the engine back together and spend money on the short block right now (and Schumacher Headers).

Still need to go over the block but the cylinders are shiny (no cross hatch visible) and measure at 4.34, which tells me it is ready for overbore and hone. This is just FYI to backup my thoughts that the heads are good to go.