The 4-D neck reamer will make your life MUCH easier, so if the rifle is a decent buy and you like it, go for it (they dont make 'em anymore and dont come up for sale very often).
Short the reamer job get Starline brass (a bit thinner necks than WW) and .378-.379 KINDA SOFT cast bullets and maybe the Lee Factory Crimp Die and you should get good chambering and extraction/ejection and enough bump-up to be accurate. At least, mine are, as always, YMMV. The original type (pre-SAAMI) chamber they seem to have duplicated was for Black Powder and soft lead bullets of BORE dia. which would bump up. After the advent of smokeless the successful cast bullet methodology changed. Many commercial cast bullets are too hard for this.
And I should mention, I dont resize cases, just decap, recap, powder and fit the largest bullet that comfortably will go in. If you shoot hot loads you may have to resize, or when cases get iffy about ejection.
I use a Lee Universal Decapper and Hand Priming Tool, and the FCD will make sure the bullet doesnt want to come back out. Only you can decide if you want to buy the whole die set right away.