440 conversion oil pan problems

Hi, I'm putting a 440 into my 1970 Dart Swinger (A Body). The 440 already had a 669 or 699 (I can't remember) which is the same as a 187 oil pan on it that will work with my steering linkage but where the problem lies is that the guys building the engine for me thinks that the oil capacity is not enough for a high volume pump. They want a bigger pan for more oil. My question is does anyone know whether the 699 pan will be enough or is there any other pan I can get to carry more oil and clear my linkage? Thanks for the help, Dave!!!!!!!!!!!!!!!