The last three items on your estimate are for head work. If you are going to replace the heads with a set of AFR units why would you spend money on your old heads? Also now is the time to replace the stock camshaft not later. Where are you getting your direction if this is your first engine build? Do you have a step-by-step manual or someone experienced in engine building to guide you? There are a lot of pitfalls you need to be aware of; just one being unique flat tappet cam and lifter break-in.