Question on BBC Rocker Ratio

[Camaro_nut2001]

I've got a buddy that's runnin a 454 in his '68 GMC. He has asked me what the advantage/disadvantage is on runnin a 1.8 ratio roller rocker versus a 1.7. I cannot answer his question other than it raises his lift a tiny bit, lol so I need ya'll's answers please. He put a cam in goin off another buddy, that dirt track races, recomendations. Says he can't really hear his cam hit & was told to raise his rocker ratio to 1.8 opposed to puttin a bigger cam in. I told him he had to mate his cam with his heads, CR., etc.. & over cammin would kill his power. It's a stock bore '84 model 454 with peanut port, 236 I think, heads on it. It's a 262/268, .505/.515 with a 112 lobe sep. Would changin to a 1.8 ratio help him "Hear it Hit"? I would also like to know the adv/disadv. lol. Thanks.