Well I would rather know are your new pistons flat tops, dished or have a small dome?
There is no 305 that came with a 1.94 intake they always used either 1.72 or 1.84 also there are several different chamber sizes for 305 heads.
The 350 could have 1.72 or 1.94 or 2.02 intake valves so if you compared them and theyre the same you have 1.72 intakes. Better get a small ruler and measure them, also casting numbers will help too. Let us know what you find.