confused on swapology

[shawnxj]

ok i've heard some 4.0 heads won't work on some 4.0 blocks and some intakes and exhaust manifolds won't mate up right to fit on any other head then the 1 they came with. somebody school me please cause all i can find is heresay. so basically i just made a deal on a renix block but want to know what heads will fit on it and what intakes and exhausts will fit on that head

[yuppiexj]

All 4.0 heads will bolt to all 4.0 blocks.

Renix heads need Renix intake and exhaust manifolds. (the HO exhaust will physically bolt to a renix head but the lack of EGR is a big stumbling block).
The HO heads can have any year HO intakes (get the 99+ model it's gooder) The exhaust ports in the later years are smaller (higher velocity, faster Cat light-off, better torque) they need to match.

The Renix blocks are allegedly stronger due to higher nickel content.

I'd use a Renix block (they are cheaper to get usually free),7120 head (decent flow out of the box), and 1999+ intake manifold (broadens torque curve).

[shawnxj]

thanks for the info