225 slant rebuild for more power

First off, welcome to the forum. There’s a wealth of knowledge here that the guys will be more than willing to share with you. The 2 barrel would be a good start. A larger exhaust from the manifold back would also be a great upgrade. Since the motor might be going to the machine shop, measure how far down in the hole the pistons are - I would guess at least .175. That leaves you plenty of room to shave the head and/or deck the block which is going to increase the compression. Just these mods will provide a decent boost in power - not V8 style power - but a noticeably increase.

i have a 65 slant that got bored 30 over, the block decked 90 thou and the head cut 10 thou. With the cam I ordered, I suspect it will run pretty good with my triple Weber’s, Headers and my 4 speed.