a18 a20 dual sidedrafts

hey guys iv looked for bout 45 min now im just getting frustrated of looking or maybe i didnt type the right words to search.
i have a18 block and a20 head and prelude dual side drafts. wat do i need to do to make the a20 head work and will the dual side drafts work and will my dx dizzy fit on the a20 head

im wondering wat head bolts do i need a18 head bolts becasue they screw inthe block r the a20 head bolts because its a20 head also wat gaskets do i need ur answers would be greatly appreciated. please no smart ass coments.
thanks let me know wat i need to make this work

To be honest your doing this the wrong way round! lol! best combination is to use a A18 head with a A20A3/4 block, this way you get the stock CR ratio of 9.4:1 and then slap a high compression head on which will boost this to around 10.5:1 or even higher if you skim the head down a bit like 1mm or so. Then you can run the prelude side draft carbs or any other pair of large bike carbs, a cam, some porting work and some back cuts on the stock valves to match the stock 3 angle seats, a nice header, no CAT if you can, 2.25" mandrel bent exhaust and you'd be easily making around 140-150bhp with oodles of torque!

The other way round would mean smaller CC less compression and also you won't be able to run the same carbs you'd have to use the A20 downdraught instead and maybe convert to weber DGV 38/38.