my plans were to ls/vtec with a gsr head w/ itr internals and ctr cams. my question is, is there a difference between the gsr head and itr head, i mean like, volume in the combustion chamber. i ask this question because i look up pirce the itr internals and it came up to about 1500 (tlel me if thats too much) and then theres this type r head with ctr cams for 300-400 more, port and polished. which should i choose? go with that type r head or stick with the GSR w/ itr internals?